Will Duke Energy Earn or Burn?

Margins matter. The more Duke Energy (NYS: DUK) keeps of each buck it earns in revenue, the more money it has to invest in growth, fund new strategic plans, or (gasp!) distribute to shareholders. Healthy margins often separate pretenders from the best stocks in the market. That's why we check up on margins at least once a quarter in this series. I'm looking for the absolute numbers, so I can compare them to current and potential competitors, and any trend that may tell me how strong Duke Energy's competitive position could be.

Here's the current margin snapshot for Duke Energy over the trailing 12 months: Gross margin is 39.1%, operating margin is 21.9%, and net margin is 11.7%.

Unfortunately, a look at the most recent numbers doesn't tell us much about where Duke Energy has been or where it's going. A company with rising gross and operating margins often fuels its growth by increasing demand for its products. If it sells more units while keeping costs in check, its profitability increases. Conversely, a company with gross margins that inch downward over time is often losing out to competition and possibly engaging in a race to the bottom on prices. If it can't make up for this problem by cutting costs -- and most companies can't -- then both the business and its shares face a decidedly bleak outlook.

Of course, over the short term, the kind of economic shocks we recently experienced can drastically affect a company's profitability. That's why I like to look at five fiscal years' worth of margins, along with the results for the trailing 12 months, the last fiscal year, and last fiscal quarter. You can't always reach a hard conclusion about your company's health, but you can better understand what to expect, and what to watch.

Because of seasonality in some businesses, the numbers for the last period on the right -- the TTM figures -- aren't always comparable to the FY results preceding them. Here's how the stats break down:

Over the past five years, gross margin peaked at 41.0% and averaged 39.9%. Operating margin peaked at 21.9% and averaged 20.9%. Net margin peaked at 12.1% and averaged 10.5%.

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